You will need to send the collective passport back to the passport office that issued it along with details of the error. For further information you can contact the issuing office.
24-hour Passport Adviceline: 0300 222 0000 (see terms and conditions). Calls made to 0300 numbers from landlines and mobile phones are charged to customers at their network provider's national rate. Live operators are available to assist with your enquiry 24 hours a day.